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    <title>clGetDeviceIDs</title>
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    <div class="refentry">
      <a id="idm1"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clGetDeviceIDs"></a>
        <h1>clGetDeviceIDs</h1>
        <p>Obtain the list of devices available on a platform.</p>
      </div>
      <div class="refsynopsisdiv">
        <h2></h2>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"><a class="link" href="scalarDataTypes.html" target="_top">cl_int</a> <strong class="fsfunc">clGetDeviceIDs</strong>(</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_platform_id</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">platform</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#device_type" target="_top">cl_device_type</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">device_type</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_entries</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_device_id</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*devices</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*num_devices</var><code>)</code></td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="parameters"></a>
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <code class="varname">platform</code>
              </span>
            </dt>
            <dd>
              <p>
                    Refers to the platform ID returned by <a class="citerefentry" href="clGetPlatformIDs.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformIDs</span></span></a> or can be NULL. If <code class="varname">platform</code> is NULL, the behavior is implementation-defined.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">device_type</code>
              </span>
            </dt>
            <dd>
              <p>
					A bitfield that identifies the type of OpenCL device. The <code class="varname">device_type</code> can be used to query specific OpenCL devices or all OpenCL devices available. The valid values for <code class="varname">device_type</code> are specified in the following table.
				</p>
              <div class="informaltable">
                <table class="informaltable" border="1">
                  <colgroup>
                    <col align="left" class="col1" />
                    <col align="left" class="col2" />
                  </colgroup>
                  <thead>
                    <tr>
                      <th align="left">cl_device_type</th>
                      <th align="left">Description</th>
                    </tr>
                  </thead>
                  <tbody>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_DEVICE_TYPE_CPU</code>
                      </td>
                      <td align="left">An OpenCL device that is the host processor. The host
processor runs the OpenCL implementations and is a
single or multi-core CPU.</td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_DEVICE_TYPE_GPU</code>
                      </td>
                      <td align="left">An OpenCL device that is a GPU. By this we mean that
the device can also be used to accelerate a 3D API such
as OpenGL or DirectX.</td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_DEVICE_TYPE_ACCELERATOR</code>
                      </td>
                      <td align="left">Dedicated OpenCL accelerators (for example the IBM
CELL Blade). These devices communicate with the host
processor using a peripheral interconnect such as PCIe.</td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_DEVICE_TYPE_DEFAULT</code>
                      </td>
                      <td align="left">The default OpenCL device in the system.</td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_DEVICE_TYPE_ALL</code>
                      </td>
                      <td align="left">All OpenCL devices available in the system.</td>
                    </tr>
                  </tbody>
                </table>
              </div>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">num_entries</code>
              </span>
            </dt>
            <dd>
              <p>
                    The number of cl_device entries that can be added to <code class="varname">devices</code>. If <code class="varname">devices</code> is not NULL, the <code class="varname">num_entries</code> must be greater than zero.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">devices</code>
              </span>
            </dt>
            <dd>
              <p>
                    A list of OpenCL devices found. The cl_device_id values returned in <code class="varname">devices</code> can be used to identify a specific OpenCL device. If <code class="varname">devices</code> argument is NULL, this argument is ignored. The number of OpenCL devices returned is the mininum of the value specified by <code class="varname">num_entries</code> or the number of OpenCL devices whose type matches <code class="varname">device_type</code>.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">num_devices</code>
              </span>
            </dt>
            <dd>
              <p>
                    The number of OpenCL devices available that match <code class="varname">device_type</code>. If <code class="varname">num_devices</code> is NULL, this argument is ignored.
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p><code class="function">clGetDeviceIDs</code> may return all or a subset of the actual physical devices present in the platform and that match <code class="varname">device_type</code>.</p>
        <p>
            The application can query specific capabilities of the OpenCL device(s) returned by <code class="function">clGetDeviceIDs</code>. This can be used by the application to determine which device(s) to use.</p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p><code class="function">clGetDeviceIDs</code> returns <span class="errorname">CL_SUCCESS</span> if the function is executed successfully. Otherwise it returns the following:
</p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_PLATFORM</span> if <code class="varname">platform</code> is not a valid platform.
		</li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_DEVICE_TYPE</span> if <code class="varname">device_type</code> is not a valid value.
		</li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">num_entries</code> is equal to zero and <code class="varname">device_type</code> is not NULL or if both <code class="varname">num_devices</code> and <code class="varname">device_type</code> are NULL.
		</li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_DEVICE_NOT_FOUND</span> if no OpenCL devices that matched <code class="varname">device_type</code> were found.
		</li>
          </ul>
        </div>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p><img src="pdficon_small1.gif" />
            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.0.pdf#page=31" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>, <a class="citerefentry" href="clGetPlatformIDs.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformIDs</span></span></a>, 
<a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</span></span></a>
        </p>
      </div>
      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4>
			Copyright © 
    Copyright © 2007-2009 The Khronos Group Inc. 
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
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